<template>
	<view>
	<view class="search-box">
	  <!-- 使用 uni-ui 提供的搜索组件 -->
	  <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
	</view>
	<view class="history-box" v-if="searchResults.length==0">
		<!-- 标题区域 -->
		<view class="history-title">
			<text>搜索历史</text>
			<uni-icons type='trash' size="17" @click="clear"></uni-icons>
		</view>
		<!-- 历史栏区域 -->
		<view class="history-list">
			<uni-tag class="uni-tag" v-for="(item,index) in historys" :key="index" @click="goToGoodsList(item)" :text="item"></uni-tag>
		</view>
	</view>
	<view class="sugg-list" v-else>
	  <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
	    <view class="goods-name">{{item.goods_name}}</view>
	    <uni-icons type="arrowright" size="16"></uni-icons>
	  </view>
	</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//设置定时器
				timer:null,
				//关键字
				kw:'',
				//搜索后数据集
				searchResults:[],
				//历史搜索记录
				historyList:[]
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw'))
		},
		methods:{
			input(e){
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					//如果500毫秒内没有触发事件，则将e.value赋值给kw
					this.kw = e.value
					this.getSearchList()
				},500)
			},
		async getSearchList(){
			if(this.kw.length==0){
				this.searchResults=[]
				return
			}
			const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
			if(res.meta.status!==200) return uni.$showMsg()
			this.searchResults = res.message
			this.saveSearchHistory()
			},
			gotoDetail(goods_id){
				uni.navigateTo({
					url:'../../subpkg/goods-detail/goods-detail?goods_id='+goods_id
				})
			},
			//保存历史记录的方法
			saveSearchHistory(){
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
			    this.historyList = Array.from(set)
				//对历史记录进行持久化存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
				//另外一种新增历史记录的方式
			// const result =this.historyList.indexOf(this.kw)
			// if(result==0)return
			// this.historyList.unshift(this.kw);
			},
			//清空历史记录的方法
			clear(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			//通过历史记录跳转到商品详情页的方法
		  goToGoodsList(item){
		  	uni.navigateTo({
		  		url:'../../subpkg/goods-list/goods-list?query=' + item
		  	})
		  }
		},
		computed:{
			  historys() {
			    // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
			    // 而是应该新建一个内存无关的数组，再进行 reverse 反转
			    return [...this.historyList].reverse()
			  }
		}
	}
</script>

<style lang="scss">
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
}
.sugg-list{
	padding: 0 5px;
	.sugg-item{
		display: flex;
		justify-content: space-between;
		padding: 12px 0;
		align-items: center;
		border-bottom: 1px solid #efefef;
		.goods-name{
			//文本不允许换行
			white-space:nowrap;
			//溢出部分隐藏
			overflow: hidden;
			 // 文本溢出后，使用 ... 代替
			      text-overflow: ellipsis;
			      margin-right: 3px;
		}
	}
}
.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			.uni-tag{
				margin-top: 5px;
				margin-right: 5px;
			}
	}
}
</style>
